<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* box-shadow: offset-x offset-y blur spread color inset;
        ox-shadow: X轴偏移量 Y轴偏移量 [阴影模糊半径] [阴影扩展] [阴影颜色] [投影方式]; */
        .box {
            width: 100px;
            height: 100px;
            box-shadow:0px 0px 5px white;
        }
    </style>
</head>

<body>
    <div>
        <div class="box">

        </div>
    </div>
</body>

</html>
